hotfix : 이미지 확장자만 업로드 가능 및 에러 처리

Author: yyytir777

src/main/java/ita/tinybite/global/exception/errorcode/BusinessErrorCode.java

@@ -7,6 +7,8 @@
 public enum BusinessErrorCode implements ErrorCode {
     TEST(HttpStatus.INTERNAL_SERVER_ERROR, "TEST_ERROR_CODE", "테스트 에러코드입니다."),
     MEMBER_NOT_FOUND(HttpStatus.NOT_FOUND, "MEMBER_NOT_FOUND", "멤버를 찾을 수 없습니다."),
+
+    INVALID_FILE_TYPE(HttpStatus.BAD_REQUEST, "INVALID_FILE_TYPE", "지원하지 않는 파일 타입입니다.")
     ;
 
     private final HttpStatus httpStatus;

src/main/java/ita/tinybite/global/s3/FileController.java

@@ -25,6 +25,6 @@ public FileController(S3Service s3Service) {
 
     @PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
     public APIResponse<?> upload(@RequestPart MultipartFile file) throws IOException {
-        return success(s3Service.upload(file, "uploads/" + UUID.randomUUID()));
+        return success(s3Service.upload(file));
     }
 }

src/main/java/ita/tinybite/global/s3/S3Service.java

@@ -1,12 +1,16 @@
 package ita.tinybite.global.s3;
 
+import ita.tinybite.global.exception.BusinessException;
+import ita.tinybite.global.exception.errorcode.BusinessErrorCode;
 import org.springframework.stereotype.Service;
+import org.springframework.util.StringUtils;
 import org.springframework.web.multipart.MultipartFile;
 import software.amazon.awssdk.core.sync.RequestBody;
 import software.amazon.awssdk.services.s3.S3Client;
 import software.amazon.awssdk.services.s3.model.PutObjectRequest;
 
 import java.io.IOException;
+import java.util.UUID;
 
 @Service
 public class S3Service {
@@ -18,7 +22,20 @@ public S3Service(S3Client s3Client) {
         this.s3Client = s3Client;
     }
 
-    public String upload(MultipartFile file, String key) throws IOException {
+    public String upload(MultipartFile file) throws IOException {
+
+        String contentType = file.getContentType();
+        if (contentType == null ||
+                !(contentType.equals("image/jpeg")
+                        || contentType.equals("image/png")
+                        || contentType.equals("image/webp"))) {
+            throw BusinessException.of(BusinessErrorCode.INVALID_FILE_TYPE);
+        }
+
+        String ext = StringUtils.getFilenameExtension(file.getOriginalFilename());
+
+        String key = "uploads/" + UUID.randomUUID() + "." + ext;
+
         s3Client.putObject(
                 PutObjectRequest.builder()
                         .bucket(bucketName)